Expansible tool.



W. A. DENNBY.

EXPANSIBLE TOOL.

APPLICATION TILED MAR.9.1914.

Patented Feb. 2, 1915.

WILLIAM A. DENNEY, OF QUINCY, ILLINOIS, ASSIG-NQR TO J. R. LITTLE METAL WHEEL COMPANY, OF QUINCY, ILLINOIS, A CORPQB-ATION OF ILLINOIS.

EXPANSBLE I TOOL.

To all whom it may concern:

Be it known that I, WILLIAM A. Denney, a citizen of the United States of America, a resident of Quincy, in the county of Adams and State of Illinois, have invented certain new and useful Improvements 1n Expansible Tools, of which the following is. a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to an expansible tool and it has for its object the; production of simple, inexpensive and eilicient expansible tool provided with pliable wings or scrapers adapted to yield and engage the article operated upon.

. The preferred form of my invention comprises a rotatable spindle and flexlble wings carried thereby, the latter being movable by centrifugal force in response to a rotary movement of the spindle. The tool so constructed is particularly adapted for use n removing sand cores from castings, and in such use the revolving tool is inserted into the core to break up the body of sand and the revolving wings serve as scrapers in removing the sand from the casting. The flexible wings of the scrapers fiex in response to the rotary movement and are thrown, by centrifugal force, into engagement with the casting to be cleaned, and as thetool is forced through the core in the hole in the casting the "wings or scrapers press against the wall of the hole, thereby loosening and completely removing the core.- Owing to the flexibility of the wings of the scrapers the tool maybe used in removing taperedsand core or cores of different diameters, and the flexible wings will bend freely to firmly engage the castings containing such cores.

Figure I is a side elevation of my expansible tool.- Fig. II is a top or plan view of a portion of the tool shown in Fig. I. Fig. III is a perspective view of the scraper.

In the accompanying drawings; A designates a spindle which may berotated by any suitable member designated by B. At the forward end of the spindle is an extension C comprising arms 1 suitably secured to the spindle, and in which, beyond the end of the spiindle, is mounted a transverse connecting to 2. I

D designates a guide secured to the spindle A at a considerable distance from the forward end of the spindle. This guide is Specification of Letters Patent.

Serial No. 823,373.

preferably composed of a pair of bars 4 secured to the spindle and alined with the arms 1 of the extension C, and rods 5 arranged in said bars and spanning the space between them.

A scraper, comprising wings 3, is carried by the spindle A, this scraper being arranged partly within the extension C, partly within the uide D, and extending longitudinally of t 1e spindle between the devices C and D. The scraper is of U-shape in form and is made from a single str p of thin metal, preferably spring steel, the strip being doubled to give the desired form to the scraper. The loop at the closed end of the scraper is loosely arranged within the extension C at the forward end of the spindle A and the scraper wings 3 extend backwardly ,alon the spindle and into the guide D, within which the rear portions of said wings are loosely disposed. Abutments 6, in the form of hooks at the rear ends of the wings or scrapers, engage the guide rods 5 when the wings or scrapers move from the position shown in full lines, Fig. l, to the position seen in dotted lines. These abutments limit the lateral movement of the wings or scrapers. 1

Each scraper Wing is a thin flexible blade having a broad outer face adapted to engage the article operated upon and a narrow cutting ed e at one side of said broad outer face. he ends of the scraper wings are secured to the spindle, and the flexible middle portions of said wings are bowed'away from the spindle when the tool is in operation.

When the spindle is rotated the flexible wings of the scra ers arethrown outwardly from. the axis of t e spindle by the action of centrifugal force, and if the wings are not obstructed .in their movement, by contact with the wall of the holein which they operate, the abutments 6 engage the-guide rods 5 and the wings will occupy the positions shown in dotted lines.

In the practical use of my expansible tool the forward end of the tool is presented to the core in a casting which it is desired to remove, and upon the tool being rotated the arms 1 of the wing holder 0 at the forward end of the tool are caused to first bore into the core with the result of producin an opening therein into which the wings o the scrapers of the tool may enter. The wings of the scrapers are thereby permitted to Patented Feb. 2, l 915. i

' gain access into the'core during the rotation of the tool, and as the rotation of the tool is continued the arms of the extenslon constantly create a bore for the scrapers'in ad- Vance of them. The wings of the scrapers bend or flex to conform to the sha e of the hole in the casting, irrespective 0 whether or not the hole is tapered, and said wings of the scrapers are constantly moved outwardly toward the wall of the hole in the casting due to centrifugal action tending to throw the wings outwardly or laterally relative to the spindle by which they are carried.

It will be understood that in removing cores from a casting by the use of my tool it is necessary to pass the tool through the hole in the casting to a sufficient extent to cause the wings 3 to scrape all of the core therefrom, and it will, therefore, be obvious that to permit this there should be considerable length of spindle back of the wing guides D. o

I.claim v p I 1. A11 expansible tool comprising a spindle, a'nd'a scraper wing loosely fitted to said spindle at both of its'ends and flexible outwardly-relative to the axis of the spindle intermediate' of its ends in response to rotary movement of the spindle.

- 2. An expansible tool comprising a spin-.

dle, and a scraper wing loosely fitted to said spindle at bothof its ends, one of said ends being movable approximately parallel with the axis of the spindle, and the portion of the Wing intermediate of its ends being flexible outwardly relative to the axis of the spindle in response to rotary movement of the spindle.

3. An expansible toolcomprisin a spindle having a wing holder at one of its ends and a wing guide intermediate of its ends, and a doubled scraper including a pair of scraper wings a proximately-parallel with the axis of sai s indle, the said scraper having its double end portion arranged loosely within said wing holder and the ends of its wings slidably arranged within said wing guide.

4. An expansible tool comprising a rota.-

table spindle, and scraper wings yieldingly secured to said spindle and ada tedto be table spindle, and a long thin flexible blade folcledon itself to produce .a pair of oppositely disposed scraper win s which lie at opposite sides of said spind e, each of said scraper wings being in the form of a thin flexible blade the middle portion of Which I is bowed away from I said spindle and the end portions of which are loosely fitted I r. to said spindle, the bowed middle portion of each of said thin flexible blades being movable away from the axis of said spindle in response to a rotary movement ofthe s indle, and each of said bowed middle portions being provided with anarrow cutting edge and with a broad outer face adapted to en-' gage the article to be scraped.

WILLIAM A. DENNEY.

In the presence of- OLIVER B. WILLIAMs, NEVEDA SLPROCTOR. 

